Modify Rec Buffer - Fujitsu Eternus web GUI User Manual

Chapter 8 Advanced Copy Management
8.2 Functions in the Action Area for Advanced Copy
4
8.2.15

Modify REC Buffer

This function sets parameters of the REC Buffer for copying data via the REC Buffer (in Asyn-
chronous Consistency mode).
The "Consistency mode" secures the order of data transfer to the remote device for all of the
specified REC sessions. This mode requires constant securement of the dedicated REC Buffer
in the cache memory. Copying via REC Buffer stores multiple REC session I/Os in the REC
Buffer for a certain period of time, and copies in blocks.
The procedure to set the REC Buffer is as follows:
Procedure
1
Click the [Done] button to return to the [Copy Path] screen.
• Perform REC Buffer settings in both the REC copy source and
destination devices. Make the REC Buffer size the same for the devices
of the copy source and the destination. The size will be adjusted to
whichever is smaller.
• When changing or deleting REC Buffers, suspend the sessions using
the target REC Buffers.
• When performing bidirectional data transfer, settings for "Send" and
"Receive" REC Buffers in the ETERNUS DX Disk storage system are
required.
• The following REC Buffer capacity is secured for the cache memory of
each controller:
- ETERNUS DX90 S2: 512MB
- ETERNUS DX410 S2: 4096MB
- ETERNUS DX440 S2: 8192MB
• The number of REC Buffers, which can be configured, are as follows:
- ETERNUS DX90 S2: Up to 4
- ETERNUS DX410 S2/DX440 S2: Up to 8
• This function cannot be used when the remote device and/or copy path
is not set.
• If the usage of the REC Buffer, to which the REC Disk Buffer has
already been assigned, is changed to "Receive" or "Unused", the REC
Disk Buffer assignment will be cleared (the REC Disk Buffer itself will
not be deleted).
Select the target REC Buffers to be modified (multiple selections can be made),
and click the [Modify REC Buffer] in [Action].
ETERNUS Web GUI User's Guide
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End of procedure
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